linux-kernel - Re: Suspicious compilation warning

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Message-ID: <20100504174507.GI30601@n2100.arm.linux.org.uk>
Date:	Tue, 4 May 2010 18:45:07 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Marcelo Jimenez <mroberto@...i.cetuc.puc-rio.br>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"H. Peter Anvin" <hpa@...or.com>, Yinghai Lu <yinghai@...nel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: Suspicious compilation warning

On Tue, May 04, 2010 at 02:35:50PM -0300, Marcelo Jimenez wrote:
> Hi,
> 
> On Tue, Apr 20, 2010 at 20:07, Russell King - ARM Linux
> <linux@....linux.org.uk> wrote:
> >
> > Well, it'll be about this number on everything using sparsemem extreme:
> >
> > #define SECTIONS_PER_ROOT       (PAGE_SIZE / sizeof (struct mem_section))
> >
> > and with only 32 sections, this is going to give a NR_SECTION_ROOTS value
> > of zero.  I think the calculation of NR_SECTIONS_ROOTS is wrong.
> >
> > #define NR_SECTION_ROOTS        (NR_MEM_SECTIONS / SECTIONS_PER_ROOT)
> >
> > Clearly if we have 1 mem section, we want to have one section root, so
> > I think this division should round up any fractional part, thusly:
> >
> > #define NR_SECTION_ROOTS        ((NR_MEM_SECTIONS + SECTIONS_PER_ROOT - 1) / SECTIONS_PER_ROOT)
> 
> Seems correct to me, Is there any idea when this gets committed?

What should be asked is whether it has been tested - if not, can we find
someone who can test and validate the change?
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